Pneumatic-valve mechanism.



K. I. LINDSTRUM.

PNEUMATIC VALVE MECHANISM.

APPLICATION FILED DEO.1'7, 1909.

968,861. Y Patented Aug.30,1910.'

f Lfl 6 good examples. 20,

UN TE STATES PATENT oFrioE. I

' xiwu'r IVAB nmnsrnom, osNYxvA'rm, SWEDEN;

PNEUMATIC-VALVE MECHANISM.

To all whom-it may concern:

Be it known that I, KNUT IVAR LIND- s'rRoM, proprietor, a subject of theKing of Sweden, residing at Nykvarn, in the Kingdom of Sweden, haveinvented certain new and useful Improvements in Pniimatie ValveMechanism; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enableothersskilled in the'art to which it appertains to make and use the same.

This invention relates to mechanism for reciprocating the'slide valve,thereby shifting the action of the air or suction as the case may be insuch manner as will reciprocate the pistons in such mechanism, of whichthe ordinary rock drill, milking machine and other pneumatic hammers areThis invention relates more particularly to means for instantaneouslythrowing the valve slide from one position to another, thus changing, ateach change of position of the slide, the direction of motion of thepistons and is shown in the present application applied to milking macinery, or 1s so de- SCIlbBd. hereafter, also being described inconnection with a pressure current of air, but of course a suction wouldserve the same pur ose.

T e chief object is to provide means for instantaneously throwing theslide, another amon others is to provide an air cushioningefl'eetlretween the'ends of the pistons and the far ends of thecylinders, all of said objects being accomplished by the constructionand combinations of parts hereinafter more particularly set forth andclaimed.

In the accompanying drawings: Figure 1 represents a view in sideelevation, partly in section, of-a device embodying my mvention; Fig.2,. a top plan view of the same, partly in section; and Fig. 3, asectional view of the same on line AA of Fig. 1.

1 designates the double cylinder in which the pistons 3 reciprocate.

3 designates the pistons reciprocating in said double cylinder andconnected by a iston rod 2 on which are mounted the col- 50 i are orshoulders 18 and a slidable part 17, this part being provided with twostuds 25 projecting both above and below and arranged one on each sideof the middle of said part; the collars or shoulders 18, above referredto, limiting the movement of said slidable part 17 on said piston rod 2.

' double same. The spring 19 being 4 designates a casing arrangedon topof most of passageways 21 and 22, which in' cylinder 1 and provided withchan- Specification of Letters Iatent. v Patented Aug, 30, 1.910, I 4Application filed December 17, 1909. Serial No.

turn communicate with outlets 7 and 8 re-' spectively. These passageways21 and'22 extend down through the bottom of casin 4 and through the topof easing 1, commune eating with the interior of the cylinders neartheir far ends.

s 10 designates the casing for slide-valve 12 Q and is mounted on top ofeasing 4 in such manner that its interior communicates with channels 5and 6.

11 designates the pressure ipe passing through the end'of, and secure inany suitable manner in, said casing 10 and communieating directly withthe interior thereof. Of course a suction pipe could be substituted sbefore mentioned without avoiding the invention.

The slide 12 above referred to is provided with two lugs 13 on itsunder; side, one on each side, and both an equal distance from, themiddle thereof.

14 designates a pivoted arm mounted in,

and half way between, the ends of easing. 4,

and half way between the' two cylinders 1 and having its upper end arraned between and to engage the lugs 13 of slide-valve 12 and its lowerend. adapted to be engaged by lugs 16 of slidable part 17 forreciprocating said slideto cover and uncover the openings of channels 5and 6 (see Fig. 1 15 designates the pivot on which said arm 14 ,ismounted.

19 designates a- U-shaped spring under compression secured by screws 23or other suitable means to the end of one of the cylinders (see Fig. 2)and provided with perforated lugs 24 at its ends (see Figs. 2 and 3).

2O designates two links, one each end of said spring 19 an with itsotherend the corresponding stu 25, above referred to (see Figs. 1 and 2) theinner ends of said links being curved in concave form to provide ahearing so ivoted to ,engagin that said links may swing from oneposition pins or studs 25, it will be ut under compression as soon asthe sl da le part 17 has reached its central pos1t1on of travel; as

soon as this point is passed the end of the' spring will contract, forthe links will no longer be standing at right angles to said slidablepart, and in so contracting they will force the links to fold eithertoward or from it, as the case may be (see Fig. 1) and in such foldingthe links will force the slidable part either to one end or the other ofits travel instantaneously (see Fig. 1). In such travel the lugs 16 ofpart17 will of course engage the lower end of arm-14 and throw theslide-valve in theopposite direction of travel, thus formingcommunication with the channels and passageway not in use in theprevious movement, thus letting air into the cylinder before the end ofthe piston reaches the end of said cylinder and thereby forming an aircushion for the same and at the same time shutting off the air from thechannels and passage-way 1n use in the previous action.

der pressure is admitted through passing through agparatus to beactuated, the air being cuto from channel 6 by slide 12. The airassageway 21 is in the meantime 'gra ual y forcing the pistons 3, andthrough'the left hand shoulder '18, the

slidable part 17 and studs 25 to the right,

thus gradually expanding the ends of the spring'19 through the llnks 20and thus putting the U-shaped spring 19 under compression, said springnot being of suflicient strengthto prevent such movement of the pistons.As soon as the studs 25 have passed the middle point of their travel thedead point of the spring 19 will-have been passed part 17 arm 14 and InS 13 throwing and its ends will then contract, throwing part 17; lugs 25and the links 20 to the right and through lug 16 on the left-hand end ofthe slide-valve to the left, t us cutting o the air supply to channel 5,outlet pipe 7 and passageway 21 by covering the end of channel 5 and atthe same time uncovering channel 6, thus supplying channel 6,.pipe 8 andpassa eway 22 with air. This will of course 1ntro uce air into the endof the right-hand cylinder between the end of said cylinder and the endof the piston thus forming an air cushion for the same. As soon as theright-hand piston is forced to a certain point to the left the reverseaction on the part of the slide, slidable part 17, and links 20 willtake place.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. In combination, a slide valve for pneumatic apparatus, a doublecylinder, two pistons working in said double cylinder, a rod connectingsaid pistons, a part slidably mounted on said rod, saiid part having 3.lug on top neareach end and a stud on each side of the middle of andprojectin above and below said part, a spring un er pressure, linkspivoted at one end to the ends of said spring and having their otherends recessed to engage said studsrespectively, said links creasing ordecreasing the compression of occupy in relation to a right angle.

2. In combination with a slide valve for pneumatic apparatus, adoublecylinder, two pistons working in said double cylinder, 9. rod connectingsaid pistons, a part slidably mounted on said rod, and provided withlugs for operating the valve a spring, and ivotal connections betweenthe said slidab e part and the ends of said spring, the abovemenswinging in relation tosaid studs and insaid spring according totheposition they tioned devices being arranged and adapted to increase ordecrease the resilient action of said spring according to the changes ofosition of said pivotal connections substantially as set forth.

3. In combination with a slide valve and a pair of cylinders havingtheir piston rods connected, a part sliding on the means of connectionof said rods-and adapted to reconnections between said part an of saidspring whereby the change of angle of said connections will vary theresilient action of said spring substantially as set forth. v r

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses. KNUT IVARLINDSTRGM. Witnesses:

NORVALD Nrs'raom, HARRY ALBILM.

ciprocate said valve, a U-shapeds ring and the ends Y

